Improvement in mica chimneys for lamps



' BAIRD & FISHER.

Lamp Chimney.

Patented Aug. 9,1870,

tion.

JOHN BAIRD AND WARREN FISHER, l? HAMILTON,. OHIO.

IMPROVEMENT IN MIQA CHIMNEYS FOR LAMPS.

Specification forming parb of Letters Patent N0. 106,247, datecl August9, 1870.

Be it known tha1; wo, JOHN BAIRD and WARREN FISHER, of Hamilton,Butler county, Ohio, have invenned a new and useful Mica Ohimney for Lamps, of whieh the-following is a speoifioation.

Ou1 invention relaoesto an ituproved 0011- strucfiion 01 manufaoture 0f a lamp-ohimney eomposecl of a sheet of mioa united into a 0011ioal form, and proteotetl a1: its top ancl bottom edges by strips or bancls of elastie sheetlorass.

In the drawings, Figure 1 is a. perspeotive view of a lamp-ehimney emloodying 0111 inven- Fig. 2 represents a sheet of miea eut to proper shape for one of our ohimneys. Fig. 3 is a horizontal seenion through the lower band.

A, F1'g. 2, represents a sheeb of mies out to the requirecl form for zu lamp-chimney, and A,

Fig. l, represents the same sheet bent into a eoniofrustum, 'ancl having its overlapped erlges seourecl by olips B, of thin sheet-brass, whioh,

beiug insertecl through eorresponding holes 01 .very effeotually to its proper oiroular form,

and are non lialole to be readily shifted or displaoed, while ehe bauds O O effeetually prooeet the top and bot-tom edges from fracture,

ancl also, although suflioiently elastio to fit.

snugly 130 the1'r plaoes, Will return to their proper forn1 when left ab liberty. In fach, the entire ohimney is elastie, bhe brass portions as well as the mioa yielding to any pressure or blow, and returning 130 their proper form Without fraoture o1 defaeement, while the very small surfaoe oovered by said brass portions cloes not materially detract from the transparen1: qualibies of the ohimney. v

Wo have desoribed oho metallio portionsof our ohimney as made of brass; but lt is evident thab German silver or other metal might be employed.

WVe are aware that lamp-ohimneys 0f mioa h2we 1ong been used, and that they have been strengthenecl With metallie bands; but our improved ehinmey is superior to those heretofore usecl, in having its strengthening bands so oonstructed and appliecl that 1they Will be as 

